Road roller



Nov .16, 1937. Y A. w. AlTKEN 2,099,590'

ROAD ROLLER Filed March 2; 1937 s Sheets-Sheet 1 A. W. AlTKEN Nov. 16,1937. 1

ROAD ROLLER Filed March 2, 1937 3 Sheets-Sheet 2 A. W. AlTKEN ROADROLLER Nov. 16, 1937.

3 Sheets-Sheet 3 Filed March 2, 19 37 Patented Nov. 16; 1937 UNITEDSTATES PATENT OFFICE Application March 2, 1937, Serial- No. 128,661 I 12Claims.

This invention isa novelimprovement in road rollers and like vehicles;and the principal object of the invention is to provide such vehicleswith an auxiliary roll disposed intermediate the front 5 and rear rollsor wheels of the vehicle, and disposed slightly in advance of the centerof gravity .of'thevehicle, with novel means for raising and lowering theauxiliary roll in a rectilinear path with respect to the road surface,whereby when 1 the intermediate roll is engaged with the roadsurface'substantial-ly the full weight of the vehicle will be exerteddownwardly upon thei-ntermediate roll to roll or smooth anyirregularities in the road surface. Y

A further object of the invention is to provide suchroad roller orvehicle with novel guide frames disposed at opposite sides thereof andrigidly fastened to the roller or vehicle frame, said guide frameshaving rectilinear guide slots therein sloping downwardly andrearwardly, and having blocks slidably mounted therein, said blockscarrying the ends of the fixed shaft on which the intermediate roll isrotatably mounted; fluid cylinders being provided mounted at oppositesides of the frame substantially in axial alignment with the axis of theguide slots, said cylinders-having pistons therein carrying piston rodshaving their outer lower ends pivotally con- 7 nected to a second shaftfixedly connected by journal castings to the upper ends of the blockswhereby-theblocks are caused tobe reciprocated in unison in the guideslots; means being provided for adjusting the connection between thejournal castings with the blocks whereby the axis .35 0f theintermediate roll maybe initially adjusted into parallel relation withrespect to the axis of the rear drive rolls or wheels; means also beingprovided at thelower ends of the guide slots for limiting thedownwardmovement of the blocks in the guide slotswherebywhen theintermediateroll is inlowermost orn operative 'positionathe lower periphery of theintermediate roll will lie in the plane tangent to the lower peripheriesof hereinafter set forth. v

I will explain theinvention with reference to the accompanying drawingswhich illustrate one practical embodiment-thereof, to enable others 50and. will summarize in the claims. the novel .features of vconstruction,and novel combinations of parts, for which protection is desired.

In said. drawings: r Fig. l isa side elevation of .a'conventional roadfamiliar with the art to: adopt and use the-same;"

roller, showingmy novel intermediate roll :and mounting applied theretotogether with the fluid cylinder operating mechanism, the intermediateroll being shown inlowermost or operative position. 5

Fig. 2 is a reduced top plan view of the road roller frame with engineor motor removed to expose the operating parts of the mounting.-

Fig. 3 is an enlarged side elevation of a portion of the frame showingmore in detail-mynovel intermediate roll and the operating means, theroll being shown in raised position in full lines, and being indicatedin lowermost or operative position in dotted lines.

Fig. 4 is a top plan view of the parts shown in 5 Fig. 3.

Fig. 5 is a reducedsection on the line 55, Fig. 3. V

Fig. 6 is a'section on the line 6-6, Fig. 3. l

The road roller shown is of conventional form, -2 having a single frontroller A, mounted in a yoke B, swiveled in the trunnion casting C, theyoke being operated by suitable steering mechanism (not shown). A pairof side frames D are connected with the trunnion casting C, the' side?'25 frames being arched. upwardly over the front roller A; Therear endsof the side frames Dare supported by rear wheels E disposed at oppositesides of theside frames and amotor F is mounted in the frame. The aboveparts are purely conventional, and form no part of my present invention.I

In order to provide headroomfor' the intermediate roller, the lowerfront portions of the side frames D are recessed as at D to a point135'side frames conforming with the contours thereof. 40 r,

Mounted in journals G in the channel irons G slightlyin advance of thecenter of gravity of the road roller is a shaft I carrying guidesZdisposed ,at opposite sides of the vehicle, said guides beingsubstantially channel-shaped as shown in Fig. 6 .45 and having webs 211on their upper faces culminating in a split bearing 21) mounted on theends of shaft I, said guides having inwardly extending portions 20 attheir lower ends adaptedto contact with the under sides of the channelirons G to which the extensions 20 are secured, as by rivets 2d asshown, shims 2e if desired being inserted between the extensions 20 andchannels G in order to properly align the axes of the channelsof theguides whenassembling the parts. The guides 2 in Fig. 6, the upper andlower faces of blocks-mak are thus rigidly secured to the frames D, thesame being non-rotatably mounted on shaft I byhavdisposed in the sameplane, said axes slopir'ig downwardly and rearwardlyof the machine as:

shown.

Slidably mounted within the gui-desare blocks 4, preferably alsochannel-shaped butfacing in it the opposite direction than the'guidesas" shown ing a. sliding fit within the channels 2. Atthe lowerends of the blocks are bearings'4a (Fig. 5) i receiving the ends of theshaftj5a. of the intermediate roll 5, the shaft being non-rotatablyretained in the bearings by means of pins5b (Fig. 3) transfixing thebearings 4a an-d the ends of the shaft 5. The'blocks 4 below thebearings 4a are slightly extendedto form contact faces 42) for engagingthe lower boxed ends 2) 'of the guides 2 or to engage the depth stops 3(Fig. 3);inserted fthrough the openings 2g, so that when the blocks 4are in their lowermost positions in the' guides 2 the lower periphery ofthe intermediate roll 5"will be disposed in the plane tangent to thelower peripheries of the front and rear rolls A and E. The upper ends ofthe 'blocks '4 are preferably boxed as shownat 40 (Fig. 5), and boltedto' the boxed ends 40 are bearing castings 6 for a nonrotatable shaft 1extending between the blocks4 below theframe channels G whereby bothblocks 4 are caused to move in unison,- the shaft 1 being retained "inthe castings 6 by means of pins la transfixing'the castings ii andtheends of the shaft. Thus the blocks 4 and 'the'non-rot'atable shafts5a. and I'form a' rigid unit' slidable in the 145 guides 2 and carryingthe intermediate roll 5. If desired, shims 8 may be inserted between thecastings 6 and blocks 4 for the purpose of adjustment hereinafterexplained.

In alignmentwith the axes of the channel's'lis ashaftB journaled in theside frames D of the road roller; and mounted on said shaft are fluidcylinders l carrying journals Illa at their upper ends for the shaft 9,said-cylinders carrying pis- 'tons lOb provided with piston rods 'fllchaving bearings Ifld on their outer lower ends which engage the shaft 1,collars la. (Fig, 4) being 'pro' vided on'shaft 1 for retaining thebearings Illd properly spaced between the castings'fi 'and'the 1 collars1a.. 7 r r 'By the above arrangement the blocks 4 carrying f theintermediate roll may be moved rectilineally fin guides '2 frominoperative position shown in full lines in Fig. 3,'tooperative p0sitionishownin' dotted lines by direct thrust of the pistons me ofthe'ifiuid cylinders in. andwhien in operative positionthe depth stops 3(if necessary) at the "lowerends of the guides 2 will position theintermediate roll 5 so that its lower periphery lies in the plane of thetangent to the lower peripheries of theother two rolls A and Brandbyproper se- 'l'ecti'on' org shims :8 between bearing castings 6 i andthe'blocks'4'the axis of roll'5 maybe initially adjusted so that samewill beheld by blocks l'in a 7 position parallel with the axle of driverolls E The intermediate roll 5 when in operative position, beingdisposed in advance of but near the center of gravity of the roadroller, will carry the major portion of the weight of the road roller,and willeffectively roll or smooth any irregularities in the roadsurface. The recessed portions 5 D of the frames D allow ample headroomfor receiving the roll 5 when raised into inoperative position shown infull lines,;Fig. 3.- r The above describedconstruction thusprovides anintermediate roll attachment for road rollers in; which theintermediateroll 5 is rectilineally movably mounted in fixed guides 2secured to the roller frames D and is lowered into operative position bydirect thrust of thepiston rods 100.

:v I claim: l. Ina road vehicle having a wheeled frame; guides fixedlymounted on the frame adjacent the center of the vehicle a substantiallyrigid subframe slidably mounted in the guides; a rotatable ground rollcarried bysaid sub-frame and adapted to support the greater'porti'enofjthe-weight of the vehicle when theroll is in operative position engagingthe ground and means for 'shiftingth'e sub-frame to move said rollerative position. V

2. In combination with a road vehicle a'sfst forth in ,claim 1,- meansin said guides for' '-limit ing the downward movement of thesub-fraaelto "fix the operative position of the roll. 5

respect to the sub-frame'for aligning the same in theguidesf' V l 4. Ina road vehicle as set forth claimf l, said'sub-frame comprising bearingblocks slidable in the guides; a shaft connecting the blocks ':andhaving its ends fixedly secured therein for [maintaining the blocks inparallel relation; and said ground roll being journaled onsaidshaft.

5'. In a road vehicle as set forth in claim 1', 'said sub-framecomprising bearing blocks slidable in the guides; a shaft connecting theblocks and havjin'gs its ends fixedly securedtherein; said ground rollbeing journaled on saids'haft; a second shaft connecting the blocks andhaving its ends fixedly secured therein; and connections between theframe shifting means and said second shaft. Q f6. In a road vehicle asset forth in claim 1;'in} terconnected members mountedonthje' subeframeadjacent the guides; means for varying the positions of the members withrespect Zto'thesubframe; and said shifting means comprising fluidcylinders'adjacent the guides; pistons in'said cylinders; and pistonrods connecting the pistons with the interconnected membersf V 'I; In aroad vehicle as setffor'th inclaim l,

said; guides being spaced apart; 'and' meansfor adjusting the guides onthevehicle frame, whereby 'the'axes thereof will lie in the same plane.H

v f 8.'In afroad vehicle having'a wheeled frame; 'mernber's fixedlymountedonthe frame adjacent theicenter of the vehicle and havingrectilinear guide channels therein slopingl downwardly and rearwardly; asubstantially rigidsubframe slidably' mounted in said channels; arotatable ground 'roll carried by said sub-frame and adapted' to supportthegreater portion of the'weight of the 70 vehicle when the roll'i'sinoperative position en'- gaging the ground; and means for shifting thesub frame to move ative position; V j

9 In a road vehicle asset forth inclaimjB, a

said roll into and outof oper into and outofop- 3. In roadvehicle as setforth in claim l,

tra nsvers e shaft mounted'in the vehicle frame upon which the membersare mounted; and said members having portions underlying the frame andsecured thereto.

10. An attachment for road vehicles comprising a pair of guides adaptedto be secured to the vehicle adjacent opposite sides thereof; asubstantially rigid frame slidable in said guides; a ground rollrotatably mounted in the frame; and a fluid cylinder adapted to bemounted on the vehicle and having a piston operatively connected withthe frame.

11. In an attachment as set forth in claim 10, said frame comprisingbearing blocks slidable in the guides; a shaft connecting the blocks andhaving its ends fixedly secured therein for maintaining the blocks inparallel relation; and said ground roll being journaled on said shaft.

12. In an attachment as set forth in claim 10, said frame comprisingbearing blocks slidable in the guides; a shaft connecting the blocks andhaving its ends fixedly secured therein; said ground r011 beingjournaled on said shaft; a second shaft connecting the blocks and havingits ends fixedly secured therein, and connections between the pistonsand said second shaft.

ANDREW W. AITKEN.

